title: Study of potassium O,O'-Dibutyldithiophosphate combining DFT, 31P CP/MAS NMR and infrared spectroscopy.
abstract: Dithiophosphates are used in many different industrial applications. To explain their functions and properties in these applications, a fundamental understanding on a molecular level is needed. Potassium O, O'-Dibutyldithiophosphate and its anion have been investigated by means of a combination of DFT and (31)P CP/MAS NMR and infrared spectroscopy. Several low-energy conformations were studied by DFT. Three different conformations with significantly different torsion angles of the O-C bond relative to the O-P-O plane were selected for further studies of infrared frequencies and (31)P NMR chemical-shift tensors. A good agreement between theoretical and experimental results was obtained, especially when the IR spectra or (31)P chemical shift tensor parameters of all three conformations were added, indicating that, because of the low energy difference between the conformations, the molecules are rapidly fluctuating between them.
authors.affiliation: Department of Mathematics, Luleå University of Technology, Lulea, Sweden. Par.Hellstrom@sonyericsson.com
authors.forename: Pär
authors.initials: P
authors.lastname: Hellström
authors.forename: Anna-Carin
authors.initials: AC
authors.lastname: Larsson
authors.forename: Andreas
authors.initials: A
authors.lastname: Fredriksson
authors.forename: Allan
authors.initials: A
authors.lastname: Holmgren
authors.forename: Sven
authors.initials: S
authors.lastname: Oberg